Effect of 2.94 µm Er: YAG laser on the chemical composition of hard tissues. Issue 8 (21st May 2018)

• Record Type: Journal Article
• Authors: Aljdaimi, Abtesam; Devlin, Hugh; Dickinson, Mark; Alfutimie, Abdullatif
• Other Names: Mao Chuanbin specialEditor.
• Is Part Of: Microscopy research and technique. Volume 81:Issue 8(2018)
• Page Start: 887
• Page End: 896
• Publication Date: 2018-05-21
• Subjects: bone -- dentin -- FTIR -- enamel -- SEM‐EDX; Electron microscopy -- Technique -- Periodicals; Microscopy -- Periodicals; Microscopy -- Technique -- Periodicals; 502.825
• DOI: 10.1002/jemt.23051
• Languages: English
• ISSNs: 1059-910X

Abstract

Abstract: The aim was to investigate the effect of the Er‐YAG laser radiation on morphology and chemical composition of enamel, dentin, and bone. The specimens of the three groups were irradiated with a very long pulse mode (VLP) of 2.94 µm Er‐YAG laser with 100 mJ pulse energy and energy density of 8.42 J/ c m 2 for 30 s, at a repetition rate of 15 Hz. The organic and inorganic content of the samples were investigated by Fourier Transforms Infrared spectroscopy (FTIR). The morphological characteristics were investigated with scanning electron microscopy (SEM) and elemental analysis (calcium and phosphorus) with energy‐dispersive X‐ray spectroscopy (EDX). FTIR data were analyzed with a One‐Way ANCOVA test and EDX data with the independent sample t ‐test. Following the laser radiation, FTIR showed a significant decrease in the organic content of all tissues. The weight percentage (wt %) calcium content of dentin and bone increased significantly following irradiation with a p ‐value of .002 for both tissues, but the wt % of phosphorus content was not influenced significantly. The morphological alterations expressed signs of fusion in all the samples. Abstract : Laser treatment of tooth does not yield a smear layer, with open dentinal tubules facilitating the penetration of adhesive composite and formation of resin tags. Er: YAG laser treatment induced chemical changes of hard tissues substrates. These changes varied with type of target tissue and the employed laser parameters. The chemical changes are mainly induced as a result of heat generated by Erbium laser. The reduction in the organic content of hard tissues is accompanied by increase in the relative content (wt %) of calcium and phosphorus in the composition.